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EE111-Lecture1

Module by: sagar markal. E-mail the author

Summary: EE111-Lecture1

Subject : EE111

Lecture no : 1

Lectured By : Prof. B. G. Fernandes

Department Of Electrical Engineering

IIT Bombay

Topic : Introduction To Electrical Systems

Video File Reference : EE111-L1

No of Pages : 18

(Refer slide time: 00:43 – 01:36)

Slide1 Overview

The overview of the course what are the various the syllabus contents is there are several transparency. The first chapter is Passive components, Signal sources, KCL, KVL, Network Theorems, Response of simple RC and RL Circuits, Sinusoidal steady state analysis of electrical circuits, Frequency Response, Balanced three phase circuits, Mutually coupled circuits, Magnetic circuits and Transformers (Refer slide time: 01:37 – 02:15)

Slide 2 Overview

D.C. Machines, Induction Machines, Synchronous Machine, Stepper motors, Ratings of generators, Motors and Transformers, Motor applications and Industrial power distribution, Protection and Safety. So basically it is just an introductory course there are large numbers of topics to be covered. I just try to give an overview. Due to studying these topics in detail in second year third year or first year (Refer slide time: 02:17 – 03:17)

Slide3 Reference Books

There are the Books of references. First one is Vincent Del Toro. The title of the book is “Electrical Engineering Fundamentals” the print is on the large number of copies there in the library the second is P. C Sen “Principles of Electrical Machines and Power Electronics”. This P. C Sen book is for the later half not for the first few chapters of the syllabus the third one is R J Smith “Circuits Devices and Systems” and the fourth one is I J Nagrath “Basic Electrical Engineering” this is for the first few chapters initial person we can refer I J Nagrath (Refer slide time : 03:18 - 03:32)

Slide 4 General Reading

and this book for general reading if you are interested the last few chapters you can refer this book and not spent much time in this and hand over the (Refer slide time 03:33 – 04:55)

Slide 5 Marks Distribution

What is the mode of evaluation? Is this first mid sem sometime in our second week of September if there is thirty percent of the weight age end sem examination for fifty percent weight age is ten percent. There is the three phases in the entire semester which i will announce well in advance but there may be a surprise quiz as well. What I am saying is whatever that I am doing in the class please go through in the room be prepared at any stage till the fourth I find that you people are not paying much attention I will conduct a surprise quiz ok that is because ten percent home assignments and attendance I given ten percent (Refer slide time: 04:55 – 06:13)

Slide 6 Notes

home assignments I will given normally distributed on Thursday we have three lectures Monday eight thirty to nine thirty Tuesday nine thirty to ten thirty and today’s lecture Thursdays lecture I will try to distribute the assignments in this assignments I will have to submit on Monday. If there are any difficulties free to discuss with me on Monday morning first fifteen minutes first fifteen to twenty minutes I will try to give a problem solving let me clarify the structure is three of this instruction there is no separate slot for tutorials it is 3006 because so what I tell is first day I will issue the assignment sheets and Monday first fifteen to twenty minutes I will try to discuss I try to solve your doubts are you agree on Monday morning first fifteen minutes I will try to discuss or try to clear your doubts (Refer slide time: 06:14 – 06:55)

Slide 7

I just go through it is essential that a student acquire an understanding of and a lively felling of values. He must acquire a vivid sense of the beautiful and morally good. Otherwise he with his specialized knowledge more resembles a well trained not in that word it is uncomfortable to write that word don’t bother what it is than a harmoniously developed person could not by me Albert Einstein (Refer slide time : 06:55 – 11:03)

What is this battery neglecter might be using for a charger mobile have you opened it and see exactly is there inside when i plugging it in this what is the input A C? I think you might have seen a sniper towards ac or some thing like that what it means you will see it is 230 volts written there. This plan goes to a mobile. What is the output voltage could be? How much a mobile requires? Let it be it is a very low voltage DC input is 230 volts AC. I want a very low voltage DC. Here is the block AC alternating magnitude sorry it is written 230 volts. I do not know what exactly it moves now we will see what it be some time later. I want a very low voltage DC. How I convert this AC to DC? May be I think you might have to study by using electricity or I can convert this AC to DC. If I use a port called bridge rectifier or if I have a diode rectifier I may get based on something like this if I rectify I will get always positive. What will be the peak of this AC? is equal to no I am not asking the value let us is equal to the peak of this AC. I said even though it is written as 230 so this value also the rectified AC the peak value is definitely very high value it will definitely not 2 to 3 volts or so and see DC is I want a approximately constant value I am able to convert this AC to a DC value I do not know how to convert the so called pulsating DC to a constant dc so try to open this and see I found there is so many parts here. I do not know what exactly why are they using? What is the function of the various parts here? I am not saying that it is going to be a crew solution should we will discuss with crew solution we will be discuss in the second or the third year as of now in the first year we will see how to get from this 230 volts AC when I plugging 230 volts supplier how to get relatively a low voltage DC. What are the various components that are used? What is the application? What is the functionality? (Refer slide time: 11:04 – 15:48)

Slide 9 Power generation and Consumption

While coming to Bombay I think you are come in road you may cross the Western Express Railway or come through connective through express highway you might have to see the huge transmission towers and see the problem here is there was number of conductors there is the multiples of three you know there are 3 or 6 I am calling it as a huge power there is a between the ground and the first conductor in addition see there are huge large number of insulators finally when it comes to my apartments cannot be wonders may not have seen come from other parts of the country so this is the shown electrical or power comes to an from a electric pole here I am calling it as a power when it comes to my apartments there are 4 conductors see here 1, 2, 3, 4 on top there are 3 see the distance of separation here between these conductors here in my apartments generally power is trans power is plot home this now these lines. Now my question is we have three wires the three conductors ok becomes 4. 3 to 4 here this is very high voltage on basic because the distance of separation is very high so one thing I know is as the voltage between potential difference in two conductors increases have to increase the distance of separation that I have studied. First of all i do not know how to get this how to generate power or how to transmit the power at this high voltage and what is being done to produce this voltage and again for three to four wires I know how I able to know. All of us know power is how do I generate electricity? I have to rotate a conductor in the magnetic field so

definitely you have to work it a conductor which cannot be to higher voltage or generation should not be at a very high voltage because it is reasonably at a high voltage definitely it cannot be at this level why it is being done that is done how you convert this three wire two wires here through four wires why are did like that we see power generation generally where are the power trans are located it is at a remote areas in because it requires a huge land at then very expensive and where is the power consumption in urban areas urban areas how it is transmitted what is being done (Refer slide time: 15:49 – 17:07)

Slide 10 Power Scenario in India

let me give you the power scenario in our country what is the total generation approximately it is in the order of 1,40,000 MW yes peak power deficit around 17 % thus the reason most part of the

countries in summer there is a sort of electricity bulk of the power generation is Thermal the generation is approximately 63% next is the around Hydro 25% approximately please note down this they are simply giving the an arc of Renewable so renewable place low around scale of among around 7.7% and Nuclear is around 2.9% now let me show the various power plants in India (Refer slide time: 17:08 – 17:32)

Slide11 Major Power Plants

[noise] Large number of the Thermal Power Plants there in the coal is not been the part of the country. Basically only the thermal power plants. (Refer slide time: 17:32 – 17:42)

Slide 12 Hydro power plants in India

This is Hydro Power Plants where are they located and last one is (Refer slide time: 17:42 – 18.30)

.

Slide 13 Nuclear Power Plants in India

nuclear very few I think you know then there are the nuclear power plants Taiga in Karnataka Dharapur, Kakrapar in Gujarat, Rajasthan Atomic Power Plant Marera in Ooty so this is the Nuclear Hydro and Thermal. What is them done is all these plants are interconnected all the generating plants are interconnected do not run in isolation usually i just tell you [noise] (Refer slide time: 18:31 – 20:10)

Slide 14

The generators that is located in Mumbai that is the Thermal Power Plant by Tata at Mahe it is near simply ok that is the power to volatile supplied by Tata’s. The generator at Mumbai and the one located at north east for the country they run approximately at the same speed I guess don’t think how big how they immediate get this I can control these two fans the speed of the two fans that is located at the same room it is extremely difficult to control the speed of these two fans you see here the generators that is located at Mumbai is one at the north east it may be run the approximately at a same speed same speed as of know I do not how they did it we will see but the generator in Mumbai the one is placed at Karwar, Kaiga may not running at the same speed. So all most all the generators (Refer slide time: 20:10 – 20:41)

Slide 15

ok and here this part of the country they run approximately at the same speed entire north plant look if the Hydro Power Plant if it is here the nuclear power plant at Marera, Rajasthan, Gujarat will be running at the same speed how they did it but then there is one plant near thermal power plant nuclear plant some hydro power plants at Karnataka ok now (Refer slide time: 20:41 – 21:29)

These two plants these two generators may not be running in the same speed. Why they did it we see later. How they did it? When they run between two places they struggles at kilometers away the generator at same speed most of the generators are been most of them misused they use same type or depending upon the nature of then we should see we have hydro we have thermal we have nuclear we can use the same type of generator same type of issue we will see how generator you see one of the primal difference principle is also the same I can able to conducted in the magnetic field if there is a case why do you want different constructions why we will see ok the other question we will ask power is power generation by wind is the wind amazing. I have to rotate a conductor in the magnetic field has the speed of rotation changes what will happen the magnetic rate of change plus time taken to complete one cycle also will change in other word the frequency no if I am leaving I will place a generator or a wind mill also in the wind mill the speed variation is continuously changing. I do which machine will I use how do this clock can I use the same generator that I used for in thermal path or I can use same plant same generator for wind application is using what are the different constructions what modification we are need to made (Refer slide time: 22:42 - 25:15)

Slide 17

Now for getting there for a application what is the time for power mega watts for very low power applications in printers what set of motor is being used see the fan the rotation is very speed. What about in the printer? Have you try to use when you give a command to the printer what happens? Some time here sound the motor there may not be ready [noise] it must be moving in steps in steps or in self what are i need to robotics robots it is not a continuous speed rotation it moves in steps see here this is one part of the motor one part of motor ok some how one thing I found is why they have done this the inner surface not varies much inner surface is not very smooth I do not know why they did this inner surface is very smooth I try to open the fan motor I try may be some times later the inner surface is very smooth and the other original that I made is the path which is rotating less conductor the law current conduct the place may be filled with circuits all of us know that so I need to have a conductor and let us add conduct the conductor has to how the current only then it experience it force for only then it has rotating that then the motor sound in this motor is the rotating part does not have conductors there are no conductors at all but let it rotates I do not know how they did let see no long whether the basic of operation that this maintains that is required to develop torque lets see I just show you one of the newspaper clippings (Refer slide time 25:18 – 26:17)

Slide 18

[noise] Super powerless US trips complete lake of US we have taken this power for granted these thinking about the power only by when do you think some how the totally the power is this totally this is for granted power is this most of the thing are granted one Sunday we look up powerless US trip what happens what could be reason I see let us know the righter side (Refer slide time: 26:21 – 26:57)

Slide 19

Western power grid fails Maharashtra again we try to get explains that just see the i am trying to tell you a total power according to Maharashtra state electricity board something happen in before and it is accepted at the time before that i say before some where in Maharashtra the other thing is grid in MP trips (Refer slide time: 26:57 – 27:11)

Slide 20

Some thing happens in Madhya Pradesh affects Maharashtra ok major power failure grips Maharashtra again see whatever be see here (Refer slide time: 27:12 – 27:45)

most part however in some parts of Bombay as there is whatever however I saw most part of the country most part of Maharashtra but then but then Bombay is what they did how they [noise]

We can compare Maharashtra with whether Bombay power is there what they did [noise] (Refer slide time: 27:46 – 28:12)

Slide 22

Major power problem in London difficult has to western grid collapse hits state Gujarat what are the reasons what went wrong? See (Refer slide time 28:13 -28:59)

that is the small slide I got major part in Bombay that all the people are waiting in the railway station when the power will come when the train will start again now try to broad picture i have to ask various questions I will see along the next lecture is going to be on Monday at eight thirty this lecture is completed thank you.

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